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Probability-Based Approach for Assessment of Roadway Safety Hardware
| 题名： | Probability-Based Approach for Assessment of Roadway Safety Hardware |
| 作者： | Wang, Q.; Fang, H. |
| 关键词： | Monte Carlo Simulation (MCS)##Roadway safety hardware (RSH)##Computational techniques##Numerical simulations##Concrete barriers##Reliability analysis##Vulnerability##Finite element (FE)##Crash simulation##Radial basis function (RBF)##Transportation safety##Nonlinear analysis##Metamodeling## |
| 摘要： | This report presents a general probability-based approach for assessment of roadway safety hardware (RSH). It was achieved using a reliability analysis method and computational techniques. With the development of high-fidelity finite element (FE) models, numerical crash simulations can be performed to evaluate various RSH systems, in addition to crash tests. For highly nonlinear and implicit impact responses, metamodeling techniques provide a rational approach to replace the expensive numerical simulations. In this study, radial basis functions (RBFs) were employed to create approximation functions of limit state/performance functions using a relatively small number of sample points. Once the RBF metamodels were created, the failure probabilities were estimated using simulation methods such as Monte Carlo simulations (MCS). Based on the proposed approach, the failure probability can be obtained at different intensity measure (IM) levels, such as impact velocities. Effective use of numerical crash simulation and a metamodeling technique permits reliability analysis in an efficient manner and minimizes the number of required crash tests. As an application area, the assessment of a New Jersey concrete barrier was studied in this project to demonstrate the probability-based approach. Various crash responses and the corresponding response limits were selected and failure probabilities were calculated. The reliability analysis method will lead to the vulnerability analysis of RSH systems. It can be used to improve transportation safety, reduce the costs of RSH systems, and potentially replace the traditional pass/fail method widely used in practice. |
| 总页数： | 48 |
| 报告类型： | 科技报告 |
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